video_filter: add formatcrop filter

This filter crops the input pictures by adjusting the format (offsets and size), without any copy (contrary to croppadd).

This is especially useful to receive pictures with arbitrary visible area (smaller than the full size), to debug vouts or filters.

Example usage:

./vlc --video-filter='formatcrop{left=50,right=100,top=200,bottom=80}' video.mp4

changed milestone to %4.0

added Component::Video: filters label

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Historically, I am pretty sure that the trick of modifying the picture meta-data did not work, hence the cropadd. If it now works, you should probably remove cropadd.

added 10 commits

• 0c42d4ad...768bb549 - 6 commits from branch videolan:master
• dfa109c3 - vout: fix update of display source crop
• 888a55c9 - opengl: fix matrix dimensions convention
• 342b390f - opengl: fix 2x3 matrix multiplication
• 935b3a5b - video_filter: add crop filter

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changed title from Draft: video_filter: add metacrop filter to Draft: video_filter: add crop filter

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marked this merge request as ready

marked this merge request as draft

resolved all threads

resolved all threads